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Coordinates: Sky map 16h 34m 23.33330s, −04° 00′ 52.0171″
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{{Short description|Star in the Ophiuchus constellation}}
{{Starbox begin
{{Starbox begin
| name=[[Henry Draper catalogue|HD]] 149382
| name=HD 149382
⚫
}}
{{Starbox image
| image = [[Image:Brown_dwarf_HD_149382_b.png|250px|center]]
| caption = Brown dwarf HD 149382 b.
}}
}}
{{Starbox observe
{{Starbox observe
| epoch=J2000
| epoch = J2000
| constell=[[Ophiuchus(constellation)|Ophiuchus]]
| constell = [[Ophiuchus (constellation)|Ophiuchus]]
| ra={{RA|16|34|23.3338}}
| ra = {{RA|16|34|23.33337}}<ref name=dr3/>
| dec={{DEC|–04|00|52.015}}
| dec = {{DEC|−04|00|52.0301}}<ref name=dr3/>
| appmag_v=8.9
| appmag_v = 8.943<ref name=aj137_5/>
}}
}}
{{Starbox character
{{Starbox character
| class = B5&nbsp;VI<ref name=mnras374_2_664/>
| class=B5VI
| b-v = −0.282<ref name=aj137_5/>
| u-b = −1.143<ref name=aj137_5/>
| r-i = −0.135<ref name=aj137_5/>
| v-r = −0.127<ref name=aj137_5/>
| variable =
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = +3<ref name=gcsrv/>
| dist_pc=74±8
| prop_mo_ra = −6.234<ref name=dr3/>
| dist_ly=241.2
| prop_mo_dec = −5.780<ref name=dr3/>
| parallax = 13.2407
| p_error = 0.0567
| parallax_footnote = <ref name=dr3/>
| absmag_v=
}}
}}
{{Starbox detail
{{Starbox detail
| mass = 0.29{{snd}}0.53<ref name=apjl702_1_L96/>
| mass=0.47
| radius=0.24
| radius = 0.143<ref name=ticv8/>
| luminosity=82
| luminosity = 25.2<ref name=ticv8/>
| metal_fe = −1.30<ref name=mnras374_2_664/>
| temperature=35,500
| gravity = {{val|5.80|0.05}}<ref name=apjl702_1_L96/>
| temperature = {{val|35,500|500|fmt=commas}}<ref name=apjl702_1_L96/>
| rotational_velocity = {{val|4.9|1.4}}<ref name=apjl702_1_L96/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=ALS 9317, HD 149382, HIP 81145, SAO 141250}}
| names=[[Bonner Durchmusterung|BD]]−03°3967, [[Henry Draper catalogue|HD]] 149382, [[Hipparcos catalogue|HIP]] 81145, [[Smithsonian Astrophysical Observatory|SAO]] 141250<ref name=SIMBAD/>
⚫
}}
{{Starbox reference
{{Starbox reference
| Simbad=HD+149382
| Simbad=HD+149382
Line 33: Line 44:
{{Starbox end}}
{{Starbox end}}


'''HD 149382''' is a [[B-type]] [[subdwarf star]] approximately 242 [[light-year]]s away from [[Sun]] in the [[constellation]] of [[Ophiuchus (constellation)|Ophiuchus]]. In 2009, a [[substellar]] companion (even a [[superjovian]] [[extrasolar planet|planet]]) was announced orbiting the star.<ref name="Geier et al."> {{cite journal | url=http://fr.arxiv.org/abs/0908.1025| author=Geier et al.| title=Discovery of a close substellar companion to the hot subdwarf star HD 149382 - The decisive influence of substellar objects on late stellar evolution|journal=[[The Astrophysical Journal Letters]]|volume=702|issue=1| pages=96-99 | year=2009 | bibcode=2009ApJ...702L..96G}}</ref>. This star has nearly half the mass of ""SOL""
'''HD 149382''' is a [[hot subdwarf]] star in the [[constellation]] of [[Ophiuchus (constellation)|Ophiuchus]] with an [[apparent visual magnitude]] of 8.943.<ref name=aj137_5/> This is too faint to be seen with the [[naked eye]] even under [[Bortle Dark-Sky Scale|ideal conditions]], although it can be viewed with a small telescope.<ref name=sherrod_koed2003/> Based upon [[parallax]] measurements, this star is located at a distance of about {{Convert|75.5|pc|ly|abbr=off|lk=on|order=flip}} from the [[Earth]].


This is the brightest known [[Subdwarf B star|B-type subdwarf star]] with a [[stellar classification]] of B5&nbsp;VI. It is generating energy through the [[thermonuclear fusion]] of [[helium]] at its core ([[triple-alpha process]]).<ref name=mnras374_2_664/> The [[effective temperature]] of the star's outer envelope is about 35,500&nbsp;K, giving it the characteristic blue-white hue of a [[Stellar classification#Class B|B-type star]]. Although only about one seventh the diameter of the [[Sun]], it radiates about 25 times as much due to its high temperature. HD 149382 has a [[double star|visual companion]] located at an [[angular separation]] of 1 [[arcsecond]].<ref name=apj743_1_88/>
{{OrbitboxPlanet begin|name=HD 149382}}

{{OrbitboxPlanet
In 2009, a [[substellar]] companion, perhaps even a [[superjovian]] [[extrasolar planet|planet]], was announced orbiting the star.<ref name=apjl702_1_L96/> This candidate object was estimated to have nearly half the [[Solar mass|mass of the Sun]]. In 2011, this discovery was thrown into doubt when an independent team of astronomers were unable to confirm the detection. Their observations rule out a companion with a mass greater than [[Jupiter]] orbiting with a period of less than 28 days.<ref name=apj743_1_88/>
| exoplanet = [[HD 149382 b|b]]
| mass = >8-23
| period = 2.391
| semimajor = 0.02343
| eccentricity = 0
| inclination = 39±13
| year = 2009
⚫
}}
{{Orbitbox end}}


== See also ==
== See also ==
Line 52: Line 55:


== References ==
== References ==
{{reflist}}
{{reflist|30em|refs=


<ref name=dr3>{{cite Gaia DR3|4354377620100892416}}</ref>
⚫
== External links ==


<ref name=ticv8>{{cite journal |display-authors=1 |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Pepper |first3=Joshua |last4=Paegert |first4=Martin |last5=De Lee |first5=Nathan |last6=Torres |first6=Guillermo |last7=Latham |first7=David W. |last8=Charpinet |first8=Stéphane |last9=Dressing |first9=Courtney D. |last10=Huber |first10=Daniel |last11=Kane |first11=Stephen R. |last12=Lépine |first12=Sébastien |last13=Mann |first13=Andrew |last14=Muirhead |first14=Philip S. |last15=Rojas-Ayala |first15=Bárbara |last16=Silvotti |first16=Roberto |last17=Fleming |first17=Scott W. |last18=Levine |first18=Al |last19=Plavchan |first19=Peter |title=The TESS Input Catalog and Candidate Target List |journal=The Astronomical Journal |date=September 2018 |volume=156 |issue=3 |pages=102 |doi=10.3847/1538-3881/aad050 |arxiv=1706.00495 |bibcode=2018AJ....156..102S |issn=0004-6256|doi-access=free }}</ref>
* http://exoplanet.eu/planet.php?p1=HD%20149382&p2=b

<ref name=aj137_5>{{cite journal | last1=Landolt | first1=Arlo U. |date=May 2009 | title=UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions | journal=The Astronomical Journal | volume=137 | issue=5 | pages=4186–4269 | doi=10.1088/0004-6256/137/5/4186 | bibcode=2009AJ....137.4186L |arxiv = 0904.0638 | s2cid=118627330 }} See table II.</ref>

<ref name=SIMBAD>{{cite web | title=HD 149382 -- Star | work=SIMBAD | publisher=[[Centre de Données astronomiques de Strasbourg]] | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+149382 | access-date=2010-10-06 }}</ref>

<ref name=gcsrv>{{cite journal | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=[[Carnegie Institution of Washington]] | location=Washington | bibcode=1953GCRV..C......0W }}</ref>

<ref name=mnras374_2_664>{{cite journal | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Peletier | first2=R. F. | last3=Sánchez-Blázquez | first3=P. | last4=Selam | first4=S. O. | last5=Toloba | first5=E. | last6=Cardiel | first6=N. | last7=Falcón-Barroso | first7=J. | last8=Gorgas | first8=J. | last9=Jiménez-Vicente | first9=J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=374 | issue=2 | pages=664–690 |date=January 2007 | doi=10.1111/j.1365-2966.2006.11196.x | doi-access=free | bibcode=2007MNRAS.374..664C | arxiv=astro-ph/0611618 | s2cid=119428437 }}</ref>

<ref name=apjl702_1_L96>{{cite journal | display-authors=1 | last1=Geier | first1=S. | last2=Edelmann | first2=H. | last3=Heber | first3=U. | last4=Morales-Rueda | first4=L. | title=Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution | journal=[[The Astrophysical Journal Letters]] | volume=702 | issue=1 | pages=L96–L99 |date=September 2009 | doi=10.1088/0004-637X/702/1/L96 | bibcode=2009ApJ...702L..96G |arxiv = 0908.1025 | s2cid=119282460 }}</ref>

<ref name=sherrod_koed2003>{{cite book | first1=P. Clay | last1=Sherrod | first2=Thomas L. | last2=Koed | title=A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations | series=Astronomy Series | publisher=[[Courier Dover Publications]] | date=2003 | isbn=0-486-42820-6 | page=9 | url=https://books.google.com/books?id=4zjv84hHNPcC&pg=PA9 }}</ref>
<ref name=apj743_1_88>{{cite journal | display-authors=1 | last1=Norris | first1=Jackson M. | last2=Wright | first2=Jason T. | last3=Wade | first3=Richard A. | last4=Mahadevan | first4=Suvrath | last5=Gettel | first5=Sara | title=Non-detection of the Putative Substellar Companion to HD 149382 | journal=The Astrophysical Journal | volume=743 | issue=1 | page=88 |date=December 2011 | doi=10.1088/0004-637X/743/1/88 | bibcode=2011ApJ...743...88N |arxiv = 1110.1384 | s2cid=118337277 }}</ref>

⚫
}}

⚫
== External links ==
* [https://exoplanet.eu/catalog/hd_149382_b--564/ ]
* http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20149382b
* http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20149382b


{{Sky|16|34|23.33330|-|04|00|52.0171}}
{{star-stub}}

{{Sky|23|41|51.5299|-|05|59|08.726|136.8}}
{{Stars of Ophiuchus}}
⚫
[[Category:Ophiuchus constellation]]

⚫
[[Category:HD and HDE objects|149382]]
{{DEFAULTSORT:HD 149382}}
{{main-star-stub}}
[[Category:Planetary systems]]
[[Category:Ophiuchus]]
⚫
[[Category:Henry Draper Catalogue objects|149382]]
[[Category:Hypothetical planetary systems]]
[[Category:B-type subdwarfs]]
[[Category:B-type subdwarfs]]
[[Category:Hipparcos objects|081145]]
[[Category:Durchmusterung objects]]

Latest revision as of 02:30, 23 August 2024

HD 149382
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 34m 23.33337s[1]
Declination −04° 00′ 52.0301″[1]
Apparent magnitude (V) 8.943[2]
Characteristics
Spectral type B5 VI[3]
U−B color index −1.143[2]
B−V color index −0.282[2]
V−R color index −0.127[2]
R−I color index −0.135[2]
Astrometry
Radial velocity (Rv)+3[4] km/s
Proper motion (μ) RA: −6.234[1] mas/yr
Dec.: −5.780[1] mas/yr
Parallax (π)13.2407 ± 0.0567 mas[1]
Distance246 ± 1 ly
(75.5 ± 0.3 pc)
Details
Mass0.29 – 0.53[5] M☉
Radius0.143[6] R☉
Luminosity25.2[6] L☉
Surface gravity (log g)5.80±0.05[5] cgs
Temperature35,500±500[5] K
Metallicity [Fe/H]−1.30[3] dex
Rotational velocity (v sin i)4.9±1.4[5] km/s
Other designations
BD−03°3967, HD 149382, HIP 81145, SAO 141250[7]
Database references
SIMBADdata

HD 149382 is a hot subdwarf star in the constellation of Ophiuchus with an apparent visual magnitude of 8.943.[2] This is too faint to be seen with the naked eye even under ideal conditions, although it can be viewed with a small telescope.[8] Based upon parallax measurements, this star is located at a distance of about 246 light-years (75.5 parsecs) from the Earth.

This is the brightest known B-type subdwarf star with a stellar classification of B5 VI. It is generating energy through the thermonuclear fusion of helium at its core (triple-alpha process).[3] The effective temperature of the star's outer envelope is about 35,500 K, giving it the characteristic blue-white hue of a B-type star. Although only about one seventh the diameter of the Sun, it radiates about 25 times as much due to its high temperature. HD 149382 has a visual companion located at an angular separation of 1 arcsecond.[9]

In 2009, a substellar companion, perhaps even a superjovian planet, was announced orbiting the star.[5] This candidate object was estimated to have nearly half the mass of the Sun. In 2011, this discovery was thrown into doubt when an independent team of astronomers were unable to confirm the detection. Their observations rule out a companion with a mass greater than Jupiter orbiting with a period of less than 28 days.[9]

See also

[edit]

References

[edit]
  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e f Landolt, Arlo U. (May 2009). "UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions". The Astronomical Journal. 137 (5): 4186–4269. arXiv:0904.0638. Bibcode:2009AJ....137.4186L. doi:10.1088/0004-6256/137/5/4186. S2CID 118627330. See table II.
  3. ^ a b c Cenarro, A. J.; et al. (January 2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". Monthly Notices of the Royal Astronomical Society. 374 (2): 664–690. arXiv:astro-ph/0611618. Bibcode:2007MNRAS.374..664C. doi:10.1111/j.1365-2966.2006.11196.x. S2CID 119428437.
  4. ^ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
  5. ^ a b c d e Geier, S.; et al. (September 2009). "Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution". The Astrophysical Journal Letters. 702 (1): L96–L99. arXiv:0908.1025. Bibcode:2009ApJ...702L..96G. doi:10.1088/0004-637X/702/1/L96. S2CID 119282460.
  6. ^ a b Stassun, Keivan G.; et al. (September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256.
  7. ^ "HD 149382 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-10-06.
  8. ^ Sherrod, P. Clay; Koed, Thomas L. (2003). A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations. Astronomy Series. Courier Dover Publications. p. 9. ISBN 0-486-42820-6.
  9. ^ a b Norris, Jackson M.; et al. (December 2011). "Non-detection of the Putative Substellar Companion to HD 149382". The Astrophysical Journal. 743 (1): 88. arXiv:1110.1384. Bibcode:2011ApJ...743...88N. doi:10.1088/0004-637X/743/1/88. S2CID 118337277.
[edit]


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